Airline available-seat distance
Measurement answer
What this metric measures
Measures offered passenger capacity as available seats multiplied by flight-stage distance. The record applies to airlines and keeps its categories, units, period and boundary together.
Specification
Metric specification
- Result format
- Single value
- Unit
- seat·km — passenger-capacity distance
- Reporting basis
- Use the reporting period declared for the result; point-in-time fields use the stated measurement date.
- Aggregation
- Apply the stated formula within each declared category, then aggregate only compatible results with matching populations, periods, boundaries, units and methods.
- Pillar
- Cross-cutting
- Topic
- Operating context and scale
- Controlled domain
- Operating context and scale
- Entity type
- Metric
Reporting boundary
Use the reporter-declared organizational and operational boundary for airlines, including exclusions, estimates and value-chain scope where relevant.
Verified source occurrences
Framework coverage
This is one canonical metric. The bindings below show every verified framework occurrence without creating duplicate metric pages. Edition, disclosure, role, and relationship remain source-specific.
- Adopting DisclosureSource evidence
ISSB/SASB industry-based metrics
- Publisher
- IFRS Foundation / International Sustainability Standards Board
- Edition
- Final taxonomy package published 7 November 2024
- Requirement
- Not Specified
- Relationship
- Defines Disclosure
- Mapping outcome
- Direct Evidence
- Source locator
- Record-level correspondence is retained in Sustopedia’s internal source map
- Adopting DisclosureTR-AL-000.A
ISSB/SASB industry-based metrics
- Publisher
- IFRS Foundation / International Sustainability Standards Board
- Edition
- 2024-11-07
- Requirement
- Not Specified
- Relationship
- Maps Source Identity
- Mapping outcome
- Published
- Source locator
- sasb:2024-11-07:TR-AL-000.A
Value structure
Dimensions and units
- Unit
- seat·km — passenger-capacity distance
- Reporting basis
- Use the reporting period declared for the result; point-in-time fields use the stated measurement date.
Unit meaning: Use seat·km for passenger-capacity distance; state conversions, scaling and any method-specific normalization applied.
Table fields and units
- Available-seat distance (seat·km; passenger-capacity distance)
Published dimensions
- Reporting period or measurement date
- Airlines reporting boundary
- Geography or business segment where material
- Measurement method and estimation status
Calculation method
Formula information
- Status
- Specified
- Formula type
- Sum
Formula
ASK = Σ (S_l × D_l)Multiply the qualifying count on each flight stage by stage distance and sum across stages.
Variables
| Symbol | Variable | Definition | Unit |
|---|---|---|---|
S_l | Available seats on flight stage l | Formula input representing available seats on flight stage l. | Dimensionless |
D_l | Distance of flight stage l | Formula input representing distance of flight stage l. | km |
Verified sources
Evidence and status sources
Sustopedia checked each record-specific claim directly against primary publisher material. Labels distinguish current measurement authority from future compatibility and corroborative, legal, edition, or method status context. Corroborative evidence can support a stated limitation but cannot establish the core measurement by itself.
Measurement evidence
- Measurement evidenceChecked 16 August 2026
Industry-based sustainability disclosure taxonomy
- Publisher
- IFRS Foundation / International Sustainability Standards Board
- Edition
- Final taxonomy package published 7 November 2024
- Locator
- Record-level correspondence is retained in Sustopedia’s internal source map
Supports: The official package establishes the reportable concept and hierarchy position; the public identity, field descriptions and method framing are Sustopedia-authored.
Open official source
Use with context
Interpretation boundaries
Method disclosures required
Source-edition basis: Sustopedia industry-based measurement profile, 2024 taxonomy-aligned edition (7 November 2024).
- Values for every applicable field: Available-seat distance.
- Field-level unit, scale, currency or response type where applicable.
- Reporting period or measurement date.
- Organizational, operational and value-chain boundary, including exclusions.
- Estimation, restatement, conversion and method-edition notes.
Record-specific limitations
- Comparisons require compatible populations, periods, boundaries, units, category definitions and measurement methods.
- Scaling, conversion and classification choices can materially change the reported result and must be disclosed.
- The formula is valid only for the stated population, unit basis and category boundary.
Interpret this metric with the stated reporting boundary, period convention, value shape, and unit. Results prepared with different boundaries or conventions may not be directly comparable.
Measurement evidence supports the core record-specific claims described above. Corroborative evidence can support limitations, while compatibility and status sources provide their separately labelled context. None of these cards by itself determines an organisation's legal applicability, filing readiness, assurance status, or compliance conclusion.